Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..477b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 2, p. 477-485.
Astronomy and Astrophysics
Astronomy
22
Disk Galaxies, Galactic Mass, Galactic Nuclei, Galactic Structure, Orbit Perturbation, Ring Galaxies, Galactic Halos, Interacting Galaxies, Rotating Disks
Scientific paper
NGC 4622's leading arm and outer pair of trailing arms are successfully reproduced in simulations. A small mass companion (0.01 of the galaxy's mass) passing close (within one-tenth of the disk radius) appears to produce the best match. The leading arm is still present in NGC 4622 close encounter simulations (retrograde) after a billion years, so these leading arms are long-lived. Small galaxies are very numerous compared to larger ones, so small-large encounters should be frequent. It is concluded that halos are comparable to disks in most galaxies. NGC 4622 also provides an alternate way to make rings in disk galaxies besides bar excitation: the low mass companion itself initiates a leading arm and ring as it passes near the nucleus.
Byrd Gene Gilbert
Freeman Tarsh
Howard Sethanne
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